Yes everyone, Samael, the demon king of space and time can see Angels. In the bible, he is depicted as one of the fallen angels. This is touched on slightly in chapter six when Metatron is protecting Rin from Volac, another fallen angel when Samael intervenes. Metatron holds back none of his distain for Samael.

For the most parts, Angels remain elusive from sight, hence why Rin knows as few as he does.

Sorry for the comments, but I had a lot of questions.

Rin was certain he wouldn't have to deal with more demon nonsense from Samael for a while. Despite the frilly little invite from Samael to go to his little school for humans hiding a school for exorcists, Rin was perfectly happy staying right where he was. Excalibur and all. Angels and all their eccentricities.

He just wished that Michael would stop splashing holy water on his face in greeting. Making sure he was immune he said. For his safety he said.

Rin was sure it was just to amuse Metatron who always had to hide his snickering when it happened. He had recently gained his immunity from holy water so it made the most sense.

"Can we just get started already?" Rin growled. Michael gave a small smirk and drew his infamous sword, said to be able to fight Satan himself. Rin pulled out his pocketknife and let it become Excalibur.

"Don't go easy on me," Rin demanded.

"You don't go easy on me Rin. I could easily kill you if I didn't hold back," Michael responded tapping Excalibur with his own, an almost angelic clink resonating from the two blades.

Rin moved quickly, attempting to stab Michael through his chest. It wouldn't kill an angel, but it wasn't about death, it was about training to get stronger. To be ready for anything.

Michael sidestepped, avoiding the blade and used the handle of his blade to hit Rin's hand. Rin held his weapon firmly, refusing to let it drop to the ground. Rin attempted a sideswipe under Michael's arm, barely grazing the angel's shirt.

"So close little one."

"I'm not that little."

"Isn't your younger brother taller than you?"

"That does not make me short."

Michael bopped Rin on the top of his head getting a yelp from him. Metatron shook his head at Rin. He could fight. But he held back so much unless it was an enemy or he was really mad. So of course Michael was attempting to set off Rin's tempjer.

Better an angelic friend than a demonic foe.

Rin kept cool though and attempted to strike Michael again. The blades clashed with resonating clanging all too similar to church bells.

Metatron's eyes wandered away from his protected ward and gazed upon the immediate visual of Assiah. Demonic energy was growing as a whole in Assiah. He wondered if it was because of Rin and Yukio's presence. The young sons of Satan had no control over their very birth, but it was no doubt a calling card to demons to come to Assiah.

Just as it was to Raphael.

He nearly swore when he had heard Raphael had come to Assiah. He believed all demons should be kept seperate from humans, as their clashing natures often led to violence. He was sorely against half demons given how then tended to suffer from both stronger demons and fearful humans.

He was a believer that they were best released from the torturous duality of their life and would be best ending their physical life and sent straight to meet their maker. Especially if they were of a fallen angel.

Metatron could feel his feathers ruffle in slight anger. He wouldn't let Raphael meet Rin if he could help it. Rin didn't need to worry about one angel when he was walking in the path of the lord and welcomed into his church.

"Stop hitting my head!"

"Your head's as hard as rocks. You'll be fine Rin."

Rin childishly stuck his tongue out at the combatative Angel. Metatron couldn't help but smile. Even if he couldn't stop Raphael and Rin meeting, if the lord made it so, he could only think that Rin would be strong enough to not be too bothered by the archangel he never met.

Chapter. Update. It exists.